In case you were curious, Ringo Starr's birth name was Richard Starkey. Nose notwithstanding, he is not now nor has he ever been Jewish.

And no, you didn't miss anything, the conversation to which Ellen refers did not occur on camera. There will, occasionally, be events that occur off-camera in Leftover Soup.

The characters poop, for example.

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(Friday. INT: gym, EB and MH have moved on to weight machines)

MH: So he cooks?
EB: He doesn't just cook. He's like a savant or something, the Rain Man of the kitchen.
MH: Uh oh. Did he 'sperge on you or something?
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EB: Not really. But it's like... okay, he can turn Rice Krispies back into rice, but he didn't know who Ringo Starr is.
MH: He can turn what back into what? That's less of a savant, more like... Jesus.
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EB: What, Jesus doesn't know who Ringo Starr is?
MH: Jesus knows everybody by their real names. So he'd be like "Ringo who? Oh, you mean Levi Goldenbaumstein?"
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EB: I like that, in your personal reality, the Beatles are one quarter Jewish.
MH: One quarter? What, you think "George Harrison" is a real name?